Question 1

Which of the following elements is represented by the symbol 'X' in the isotope notation $$^{35}_{17}X$$?

Accepted Answer

Chlorine

Question 2

How many protons, neutrons, and electrons are present in $$^{18}_{8}O$$^{2-}$$?

Accepted Answer

8 protons, 10 neutrons, 10 electrons

Question 3

Which of the following ions is isoelectronic with argon ($$Ar$$)?

Accepted Answer

$$Cl^-$$

Question 4

Predict the charge of a phosphorus ion.

Accepted Answer

$$-3$$

Question 5

What is the mass (in grams) of $$2.25 	imes 10$$^{24}$$ atoms of nickel (Ni$)? (Atomic mass of Ni = 58.69 g/mol)

Accepted Answer

$$219 g$$

Question 6

How many atoms are present in $$2.78 g of $$barium ($$Ba$$)? (Atomic mass of Ba = $$137.33 g/$$mol)

Accepted Answer

$$1.22 	imes 10$$^{22}$$

Question 7

Calculate the wavelength (in nm) of the light with a frequency of $$3.0 	imes 10$$^{14}$$ Hz. (c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$1.00 	imes 10^3$ nm

Question 8

What is the de Broglie wavelength of an electron traveling at $$2.11 	imes 10^6$ m/s? (mass of electron = 9.11$$ 	imes $$10^{-31} kg$$, $$h = 6.626 	imes 10$$^{-34}$$ J·s)

Accepted Answer

$$3.42 	imes 10$$^{-10}$$ m

Question 9

Which of the following transitions would require the absorption of a photon of light with the shortest wavelength?

Accepted Answer

$$n=1 to$$ $$n=2$$

Question 10

How many orbitals are there in the third shell ($$n=3$$)?

Accepted Answer

9

Question 11

What is the maximum number of electrons that can occupy a $$d$$ subshell?

Accepted Answer

10

Question 12

How many significant figures should the answer have for $$2.42 	imes 3.7 	imes 7.8005$$?

Accepted Answer

2

Question 13

Which of the following atoms or ions is paramagnetic?

Accepted Answer

$$O$$

Question 14

Which atom has the ground state electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^3$$?

Accepted Answer

Phosphorus

Question 15

Rank the following atoms in order of increasing ionization energy: $$P$$, $$O$$, $$Na$$, and $$F.$$

Accepted Answer

$$Na \u003c P \u003c O \u003c F$$

Question 16

Which of the following is the correct electron configuration for $$Mn^{2+}$$?

Accepted Answer

$$[Ar]3d^5$

Question 17

How many electrons are in $$He^{2+}$$?

Accepted Answer

0

Question 18

Which of the following quantum numbers cannot occur together to specify an orbital?

Accepted Answer

$$n=2, l=2, m_l=0$$

Question 19

Which of the following species is isoelectronic with $$S^{2-}$$?

Accepted Answer

$$Cl^-$$

Question 20

What is the effective nuclear charge ($$Z_{eff}) of $$sodium ($$Na$$)? (Use Slater's rules)

Accepted Answer

7

General Chemistry I: Practice Problems and Key Concepts Study Guide

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